Passive component having stacked dielectric layers

Abstract

A passive component comprising one input electrode layer constituting an input terminal, one output electrode layer constituting an output terminal, and four shield electrode layers constituting shield terminals, all formed in the lowermost dielectric layer by via holes. The input electrode layer is connected electrically with an input-side resonance electrode, in the vicinity of the second side face of a dielectric substrate, through a via hole made in the fourth through sixth dielectric layers and an input tap electrode. The output electrode layer is connected electrically with an output-side resonance electrode, in the vicinity of the third side face of the dielectric substrate, through a via hole made in the fourth through sixth dielectric layers and an output tap electrode.

1. A passive component mounted on a wiring board including at least a shield wiring pattern, said passive component comprising a plurality of internal electrodes and one or more terminals, said plurality of internal electrodes serving as a passive circuit disposed in a dielectric substrate comprising a plurality of stacked dielectric layers, said one or more terminals being disposed in an outer surface of said dielectric substrate;
 wherein said one or more terminals are input and output terminals of said passive circuit, and all of said one or more terminals are provided only on a lower surface of said dielectric substrate; 
 wherein an internal electrode for shielding is disposed in said dielectric substrate, and said shield wiring pattern of said wiring board faces said lower surface of said dielectric substrate; and 
 wherein said internal electrode for shielding and said shield wiring pattern of the wiring board are electrically connected to each other through a capacitance. 
 
   
   
     2. The passive component according to  claim 1 , wherein said passive component further comprises at least one resonator, and said at least one resonator comprises two electrodes and a resonator via hole connecting said two electrodes, wherein one of said two electrodes defines a short-circuiting end of at least one resonator, and the other one of said two electrodes defines an open-circuit end of said at least one resonator. 
   
   
     3. The passive component according to  claim 1 , wherein, of said plurality of stacked dielectric layers of said dielectric substrate, a dielectric layer disposed between said internal electrode for shielding and said lower surface of said dielectric substrate has a dielectric constant of ∈r>20. 
   
   
     4. A passive component comprising:
 a plurality of internal electrodes constituting a filter disposed in a dielectric substrate comprising a plurality of stacked dielectric layers; 
 a plurality of internal electrodes constituting an unbalanced-to-balanced converter disposed in said dielectric substrate; 
 a terminal of said filter disposed in an outer surface of said dielectric substrate; 
 a terminal of said unbalanced-to-balanced converter; and 
 terminals for shielding; 
 wherein all of said terminals are provided only on a lower surface of said dielectric substrate; 
 wherein, of said internal electrodes of said filter, a via hole connected to said terminal of said filter is located closely to a first side surface of said dielectric substrate along said first side surface of said dielectric substrate; 
 wherein of said internal electrodes of said unbalanced-to-balanced converter, a via hole connected to said terminal of said unbalanced-to-balanced converter is located closely to a second side surface of said dielectric substrate along said second side surface of said dielectric substrate; and 
 wherein of said internal electrodes of said filter and said unbalanced-to-balanced converter, via holes connected to said terminals for shielding are located closely to a third side surface and a fourth side surface of said dielectric substrate along said third and fourth side surfaces of said dielectric substrate. 
 
   
   
     5. The passive component according to  claim 4 , wherein an internal electrode for shielding is disposed in said dielectric substrate, and wherein a dielectric layer disposed between said internal electrode for shielding and said lower surface of said dielectric substrate has a dielectric constant of ∈r<20. 
   
   
     6. The passive component according to  claim 4 , wherein said filter further comprises at least one resonator, and said at least one resonator comprises two electrodes and a resonator via hole connecting said two electrodes, wherein one of said two electrodes defines a short-circuiting end of said at least one resonator, the other one of said two electrodes defines an open-circuit end of said at least one resonator. 
   
   
     7. A passive component including a plurality of internal electrodes and one or more terminals, said plurality of internal electrodes serving as a passive circuit disposed in a dielectric substrate comprising a plurality of stacked dielectric layers, said one or more terminals being disposed in an outer surface of said dielectric substrate;
 wherein said internal electrodes corresponding to said one or more terminals are electrically connected to each other through a corresponding connecting via hole disposed in said dielectric substrate; 
 wherein all of said one or more terminals are provided only on a lower surface of said dielectric substrate, each of said one or more terminals comprising a via hole for terminals exposed on a lower surface of said dielectric substrate; and 
 wherein a diameter of said via hole for terminals is greater than a diameter of said connecting via hole. 
 
   
   
     8. The passive component according to  claim 7 , wherein said passive component further comprises at least one resonator, and said at least one resonator comprises two electrodes and a resonator via hole connecting said two electrodes, wherein one of said two electrodes defines a short-circuiting end of said at least one resonator, and the other one of said two electrodes defines an open-circuit end of said at least one resonator. 
   
   
     9. The passive component according to  claim 7 , wherein an internal electrode for shielding is disposed in said dielectric substrate, and, of said plurality of dielectric layers of said dielectric substrate, a dielectric layer disposed between said internal electrode for shielding and said lower surface of said dielectric substrate has a dielectric constant of ∈r<20.